As a thrill-seeking paramedic, Kim Zambrano has had some tough times. After her partner, Bobby, was killed in the line of duty, Zambrano sank into a deep depression that threatened her career and her life.
Following a suicide attempt, Kim made the slow ascent back to reality, with her young son Joey as her main motivation. She and her ex-husband, firefighter Jimmy Doherty, often argue over who is better equipped to care for their son, but they both have their own demons to battle.
Zambrano often works with paramedic Monte "Doc" Parker.